Steam-generator.



. H. c. amen 1 STEAM GENERATOR.

APPLICATION 'HLED MAR. 24. 1915- 1,242,438. Patented Oct. 9,1917.

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STEAM GENERATOR.

APPLlCATlON FILED mm. 24. m5.

Patented Oct 9. 1917.

2 SHEETS-SHEET 2.

UNITED STATES PATENT OFFICE.

HERMAN C. HEA'I'ON, OF CHICAGO, ILLINOIS, ASSIGNOR I? THE BAIBCOCK 8nWI'LCOX COMPANY, OF BAYONNE, NEW JERSEY, A ;COBPOBAT N 0F NEW JERSEY.

STEAM-GENERATOR;

Patented Oct. 9,191.7.

Original application filed October 7, 1910, Serial R0. 585,750. Dividedand this application. filed March 2 1. 1915. Serial No. 16,538.

5 Illino s, have invented a certain new and useful Improvement inSteamGenerators, of which the following is a full, clear, conciao, andexact description, reference being had to the accompanying drawings,formin a part of this specification.

is invention relates to a steam gener ator.

Tho-chief object of the invention is to provideiiln im roved superheaterfor steam generators. other object is to provide improved means forfiring the steam generator. Other objects will become apparent from thefollowing detailed description of a specific structure embodying myinvention.

The resent application is divisional of my (Bo-pending a plicationSerial No. 585,750, filed October th, 1910,Patent No. 1,137,137, datedApril 27, 1915.

The superheater which is claimed in the present application comprisesessentially a number of small-bore tubes extending between the watertubes of the boiler, substantially at right angles to the water tubes.These tubes are preferably connected in multiple between a pair of steamheaders,

into which the tubes are fastened, but I con-- template also such aconstruction wherein some of these tubes are connected in series.

The superheater tubes are run crosswise of the Water tubes and arelocated at a point or points where they will be subjected to the $93 ofcombustion while still at a comparatively high temperature, but areplaced at such a point that the gases of combustion will be suflicientlytempered to give a temperature such will not injure the tubes or joints.

Some of the advantages of this form "of superheator may be enumerated asfollows:

(1) The tubes are. for the greater part of their length, straight. andin consequence can readily be kept clean.

. r) The superheater headers are out of the heat zone and consequentlythe 'oints between the tubes and headers are tter protected. A

(3) The tubes as disposed tend to equalize the flow of gases from frontto back of the boiler. This is especially true when the superheater isemployed-in the type of boiler described in the parent application. inwhich the general direction of the flow of gases is upward solely, andin which a single path the ases through the tubes is made.

14) he method of construction herein described is advantageous, as itobviates in part the mechanical strains to which the Drdina U-tubesuperheater is subjected, due to its method of support or suspension.

In the accompanying drawings which form a part of the presentspecification I have illustrated one embodiment in which my inventionmay appear.

Figure 1 is a side elevation of a steam generator embodying myinvention. the furnace walls being in part broken away to reveal moreclea ytthe interior constructlon;

Fig. 2 is a sectional View taken looking in the direction of thearrow-heads on the broken lines 2-2 of Fig. 1.

The boiler shown in the drawings coin prises the water and steamdrums 1. 1. which may be of any desired number. and front and rearheaders 2 and 3, respectively. connected by the water tubes 4.

The construction of the particular steam generator illustrated in thedrawings is described in detail in the parent application above referredto. and a detailed description thereof will not be given in thisconnection.

The superheater which forms the chief point of novelty in the presentapplication comprises a plurality of smalbbore tubes 5 passing betweenthe water tubes at a distance above the lowermost water tubes 4, so thatthese supcrbeuter tubes are screened off to a certain extent from theintense heat of the fire in the furnace 6.

In the form of boiler which I have illustrated I employ bottles 7, 8, 9and 10 running lengthwise of the tubes.

-' The super-heater tubes are connected to manifolds or headers 11 and12, the manifold 12 being connected by steam-pipe 13 to the steam drums1, and the manifold 11 being connected by a nozzle 14 to thesteamdelivery pipe.

The superheater tubesare given a ninety degree bend before passing intothe manifold 12. This relieves the tubes and joints of stresses whichmight be caused by unequal expansion among the several tubes. Obviously,the ninety degree bend may be made at any convenieiyrtI point.

I have show the tubes 5 extending through the side walls 16 and 17, andthe headers 11 and 12 as being outside of the side walls, but it is tobe noted that I also contemplate mounting the headers in the side wallsthemselves whenever the same may be found more advantageous.

It is further to be noted that I contemplate employing a steel framemounted in the side walls, through which the tubes 5 may pass. and whichserves to carry the weight of the superheater in part. and which willserve as a means for preserving intact the side walls when thesuperheater tubes are to be withdrawn or replaced.

Suitable means may be prov ded for flooding the superheater whenstarting, to we vent damaging the same by excessive heating prior toestablishing a flow of steam therethrough. The superheater headers arepref erably supplied with capped openings such as are well known in theart, for allowing convenient cleaning, repairing and renewing of thetubes.

The location of the supcrheater tubes will be governed by the conditionsof a particular installation, such, for instance, as the type of thefurnace and the duty of furnace and boiler, as these factors will, to anextent, determine the exact position of the superheater tubes. If placedtoo low they will be subjected to the flue gases while at an unduly hightemperature, and this would be likely to cause trouble when largequantities of steam were not passing through the superheater. On theother hand, the tubes must not be placed too high, because the fluegases, when they leave the lower steam-making tubes, are not likely tohave a temperature sufiiciently high to ive the steam a superheat suchas would e required.

It will also be noted that I have placed the superheater tubes justbelow an intermediate bathe-plate, and these two elements cofipernte toa decided advantage in distributing the heat of the gases of combustionuniformly between the tubes in any one tier and from end to end of thesuper-heater tubes.

The arrangement above described also provides for renewals and repairs,which can readily be made, due to the accessible positions of thejoints.

A superheater is naturally subjected to severe treatment and it is ofgreat advantage that the same be not placed in an inaccessible position,and also that the structure be not secured to the main shell of theboiler, or restrained from expansion, as the amount of expansion ismarkedly greater in the superheater tubes than in the water 30 tubes.

The stoker and grate mechanism which constitutes a part of the presentinvention is shown in Fig. 1. The automatic stoker 18 is of theunder-feed type and supplies coal, or otherfuel, from the hopper 19 orother convenient source. to the chain-grate 20, which is periodically orconstantly advanced in order to feed forward fresh fuel. The chain-grate20 is supported on rollers 21, diagrammatically indicated in Fig. 1,which rollers are mounted on the track 22, so that the chain-grate maybewithdrawn.

A blower-fan 23 delivers air through the pipe 24 to provide a forceddraft for the fire.

The products of combustion pass upward through the steam tubes 4, thesuperheater tubes 5, in contact with the economizer 25, and out throughthe stack 26.

It is to be understood that, while I have not described in detail allthe features of the invention, it is obvious to those skilled in the artthat the usual fittings are to be supplied and that the arrangements ofparts may be varied to suit individual conditions, 105 these being suchmodifications as arecontemplated by my invention and as are contemplatedin the definition thereof appearing in the appended claims.

hat I claim as new and. desire-to secure by Letters Patent of the UnitedStates is:

1. A water tube boiler having-a bank of horizontally extending watertubes, superheater tubes extending transversely between rows of watertubes, a superheater box at one side of the setting protected from theflame and gases, :1 superheater box at the opposite side of the settingalso protected from the f ame and gases, the transverse superheatertubes being spaced apart to al- 1% low passage of the gases between thesame, and connected into said boxes, the superheater tubes being formedwith bends to compensate for expansion and contraction.

2. A water tube boiler having a bank of horizontally extending watertubes, superheater tubes extending transversely betweenrows of watertubes, a superheater box at one side of the setting protected from theHnpcrhrzutm' hmws being arrn'ng cd to prqvid 10 flame and uses, asuperhcnter lmx M; the for flooding: and (lruinmg thercnfl. I, oppositesi e of the setting ulsu prutucted I In witness wlmrnuf, I lmrmmto's'suhscrilz e from the flame and gases, the tl'ansvursv my name this22nd day of Milrch, A 111915.

supcrheater tubes being 5 mood apart to al- I 1 low passage of thagnsgs)etwecn tlw same, and connected into sun] buxes, the sllper- \Vitnesscs:t heater tubvs being formed with bends topmn- R. J. S'ruAsm-m,

pensnte for expansion and contraction, the Juux H. Dncxxnz.

